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BigRed's 8 Dynoed

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Old Mar 26, 2008 | 12:56 PM
  #1  
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BigRed's 8 Dynoed

Here it is:
http://www.youtube.com/watch?v=unt7PNNGvEM
175.5 HP
BTW, does anyone know if there is something that doesnt allow dynos to calculate torque for rotaries unless you have a special tool? Not sure they were right, but the dynoes were cheap; they were only 30$ for 2 pulls.
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Old Mar 26, 2008 | 01:04 PM
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Originally Posted by BigRed
Here it is:
http://www.youtube.com/watch?v=unt7PNNGvEM
175.5 HP
BTW, does anyone know if there is something that doesnt allow dynos to calculate torque for rotaries unless you have a special tool? Not sure they were right, but the dynoes were cheap; they were only 30$ for 2 pulls.
Did the dyno shop tell you this?

BTW if you want to measure torque for a given horsepower/RPM:

Torque = (Horsepower * 5252)/(RPM)

so if they gave you a HP curve, you can generate the torque curve that way.
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Old Mar 26, 2008 | 01:10 PM
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i only got 179.9 with just my sr motorsports pulleys when i did my runs.....i yet to do it since i dont my other stuff
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Old Mar 26, 2008 | 01:22 PM
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I thought its 180 stock?
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Old Mar 26, 2008 | 01:25 PM
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on his 3rd rx8
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^if your lucky...
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Old Mar 26, 2008 | 01:38 PM
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lol yup but on the other hand if you have some mods
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Old Mar 26, 2008 | 01:41 PM
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I would like to get my car on a dyno sometime soon.
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Old Mar 26, 2008 | 01:46 PM
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rpm pickup can sometimes be tricky. if they don't pick up the rpm, you aren't going to get a torque number.
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Old Mar 26, 2008 | 02:12 PM
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Originally Posted by BigRed
Here it is:
http://www.youtube.com/watch?v=unt7PNNGvEM
175.5 HP
BTW, does anyone know if there is something that doesnt allow dynos to calculate torque for rotaries unless you have a special tool? Not sure they were right, but the dynoes were cheap; they were only 30$ for 2 pulls.
You have a MT right? No way is that right. check your coils
What dyno was it? I think in a socal dyno thread a while back deedub had the hks intake +exhaust and dynoed ~190ish
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Old Mar 26, 2008 | 02:21 PM
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That is news to me that the car doesn't produce near what mazda rates it at. Or do they just measure at a different point on the drivetrain? I guess I will do some reading...

Nice video

nvm I figured it out.

Last edited by fahrfegneugen; Mar 26, 2008 at 02:26 PM.
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Old Mar 26, 2008 | 02:32 PM
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Numbers will vary on each and every dyno because variables like calibration, weather, D/A, etc. have to be put into the calcuations. As a result of this a dynograph should be used as a base method for tuning and, IMO, nothing more. You could go to another dyno shop in town and make 10hp more, or maybe even put down 5hp less.

Cars that are coil-pack-equipped like the RX-8 can be sometimes hard to pick up an RPM reading on when they hook everything up. Like said if they have problems picking up RPMs you won't be able to get a torque calculation.

Also, the RX-8 is severely overrated as far as the horsepower number goes IMO. If you get 200-215 crank horsepower (180-190whp) out of your car in stock form I think you're sitting pretty good.

Lastly, track times tell the truth on your horsepower numbers a lot better than a dyno will. The dyno calibrations can be changed to make your car have 300hp if they wanted to. The track, on the other hand, will not change them and will not lie.

Last edited by RWatters; Mar 26, 2008 at 02:45 PM.
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Old Mar 26, 2008 | 02:48 PM
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dynojet I assume?


Here are the results of the DynoDay I hosted last year. (your number is a bit on the low end but it's probably within tolerance)

1. Peterisurhero: 200.60
2. Razz1: 198.440
3. NgoRX8: 196.840
4. Newcastle: 194.540
5. xdeedubbx: 190.890
6. Jedi54: 190.290
7. Cesaralaniz: 187.900
8. Rotary Rasp: 186.410
9. Sopheak: 186.280
10. Murix: 185.430
11. Kwescott: 184.810
12. Scremn8: 184.540
13. Wing5: 178.560
14. Bao0518: 176.680
15. RXOcho: 175.540
16. Snowfl8k: 174.920


Automatic RX-8’s

1. Brgreen: 149.280
2. Jordanjerone: 145.040
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Old Mar 26, 2008 | 02:58 PM
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yes it is a mt, yes it was a dynojet. They said that it was 165 "SAE" corrected. It was a colder day... Anything that I should check? I mean, the car still runs like it came from the dealership
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Old Mar 26, 2008 | 03:00 PM
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Originally Posted by BigRed
yes it is a mt, yes it was a dynojet. They said that it was 165 "SAE" corrected. It was a colder day... Anything that I should check? I mean, the car still runs like it came from the dealership
Check the coils & plugs.
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Old Mar 26, 2008 | 03:00 PM
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engine compression
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Old Mar 26, 2008 | 03:00 PM
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check plugs and coils when you get a chance.
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Old Mar 26, 2008 | 03:03 PM
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i mean, the only place that i know of to check this stuff would be at the stealership. It is under warranty, and they have seen my mods before. they didnt really care...
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Old Mar 26, 2008 | 03:04 PM
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plugs and coils you can easily check yourself.
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Old Mar 26, 2008 | 03:08 PM
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^lol. okay then What is the easiest way? --- newbie question
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Old Mar 26, 2008 | 03:22 PM
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plugs are easy.

- jack up the front left side of car
- insert jack stand
- remove wheel (loosen lugs BEFORE lifting car. )
- straight ahead are the plugs.
- Brown is okay, black and white spots are bad.
If you've got more then 25,000 - 30,000 miles on those plugs, might not be a bad idea to just swap them out.

Here's how to check the coils:
http://www.finishlineperformance.com...16-07-1793.pdf
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Old Mar 26, 2008 | 03:33 PM
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Did you do this at Rotary Performance in Garland or did you use another shop?
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Old Mar 26, 2008 | 03:42 PM
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The plugs are easy to get to get to on this car, they are out in the open and are right down where the oil dip stick is on the driver side.
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Old Mar 26, 2008 | 03:44 PM
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You'll need a sparkplug socket as well. I assume you probably don't have one.

This is the one I use: cheapest I found and comes with other sizes:

http://www.harborfreight.com/cpi/cta...156&pricetype=
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Old Mar 26, 2008 | 03:46 PM
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Originally Posted by imput1234
You'll need a sparkplug socket as well. I assume you probably don't have one.

This is the one I use: cheapest I found and comes with other sizes:

http://www.harborfreight.com/cpi/cta...156&pricetype=
They are useful on the lawnmower too
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Old Mar 26, 2008 | 06:11 PM
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my car only has 10k miles... Not a good sign
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